您不能指定目标表“S1” FOR UPDATE FROM子句

Question

UPDATE sch_scores s1 
    SET s1.Score = '4' 
WHERE EXISTS (select * 
       from sch_scores s2 
       WHERE s2.ResultID = "24614" 
       AND s2.FormatID = "9" 
       AND s2.Score = "4") 

您不能指定目标表在FROM子句

“S1”进行更新我在得到这个错误以上查询。请问可能是什么？

Answer 1

UPDATE sch_scores 
SET Score = '4' 
WHERE EXISTS (select * 
       from sch_scores s2 
       WHERE s2.ResultID = "24614" 
       AND s2.FormatID = "9" 
       AND s2.Score = "4") 

Answer 2

无需指定UPDATE子句中的实例（删除S1）

UPDATE sch_scores 
    SET Score = '4' 
    WHERE EXISTS (select * from sch_scores s2 WHERE s2.ResultID = "24614" AND s2.FormatID = "9" AND s2.Score = "4") 

Answer 3

你不能和不需要在更新查询提供别名 “S1”。在更新时不需要给临时名称表吗？

UPDATE sch_scores 
    SET Score = '4' 
WHERE EXISTS (select * 
       from sch_scores s2 
       WHERE s2.ResultID = "24614" 
       AND s2.FormatID = "9" 
       AND s2.Score = "4")